neu

I've been thinking about porting my intake manifolds on my N/A S4, but i was curious.. i'm sure i would lose some low end, but i want to have some idea of how much i will lose, versus how much i will gain on top end... if anyone has done this could they please shed some light on this for me?

thanks,
alan

BlaCkPlaGUE

You won't gain too much porting anything until you get rid of the AFM.
It would be nice if someone could find and rehost the pics in the archive section for the porting guide... its completley useless without pics.

jhammons01

I went through the same thing and froze with inability to make a decision so the motor went back stock.

The reason I didn't want to port and loose low end is because I have (and want to keep) an automatic.

If you have a 5 speed you can still launch by revving and fanning the clutch. So really you aren't hurt any. My situation is worse becuase I have no cure. By the time mine comes alive in 1st gear you will be long gone

I wouldn't worry about losing the low end if I were you with your 5sdp. I really found no clear answer whether or not you really loose low end. The best minds on many forums disputed each other, and no one out weighed the other

neu

yeah, i've read that 5 or 6 times tonight.. it seems like it would be a nice project if i had the time to remove all my emissions junk, and port my housings as well, but then i guess to get any benefit out of all that i would have to do something about my exhaust, and god knows im too broke for all that

as for the AFM, how can you get rid of that? or would i have to go with some aftermarket upgrades to balance it out? would i have mod my TB as well for all this?

BlaCkPlaGUE

There are two things that can get rid of the afm. One is a standalone ECU, like a wolf3d, or a haltech, etc. Most piggyback units only controll fuel, so that will not work.
The other thing was an upgrade to a MAP sensor that was a piggyback for the stock ECU. Some guy posted it here on the boards and everyone got excited, until they saw the price. It was like 800 some odd $ and it was a totally fricken waste, I mean you can buy a standalone for that! Some people in retail just don't ****** get it...

anyways, if the AFM is removed, then you should see a nice difference doing a port job.

I Hate Ricers

Low end torque isn't just for racing. Who wants to fan the clutch at high revs at every stoplight?

RotaryEvolution

iTrader: (30)

i wonder if there would be a way to make an AFM off a newer vehicle work with our system, it is much more free flowing much like a tiny catalytic converter but has a bit more flow capacity, a lot more than our current systems have.

i will have to look into the reference voltages and output signal voltages to see if there is any similarities and if it could be used with a resistor to rectify the signal voltage.

i will have to see if i can find a good used GM AFM at work tomorrow.

most GM AFMs are good for flow up to and beyond 400HP, with the rotary flow characteristics it would probably be good for 300+, the stock AFM has trouble flowing up to and beyond 300HP.

BlaCkPlaGUE

There has been alot of talk about this in the past. Some guy was going to do it for a mustang AFM he had, but it never worked out at all.

The way I see it, is the ECU has fuel maps for a SPECIFIC amount of air. So just like the flap type AFM, the hotwire still is only designed to be a specific diameter for a particular allowance of air.

So even if you did get the mustang to work, then you'd probably lean out the mixture for top end, or who the hell knows. That isn't my area.

Anyone want to confirm this?

RotaryEvolution

iTrader: (30)

it probably would require the ECU programming to be changed which would make it more work than it is worth but i will still look into it unless someone has tried it before.

jhammons01

I didn't mean to imply you had to fan the clutch at every stop light. Just, you have that option should you want to "launch" or (for the old timers) peel out!

If your just leaving a stop light then max HP is not really in demand is it??

neu

you guys were talking about upgrading my ECU, would that apexi power fc work? i was thinking about saving up for one of those.. it just looks so damn sexy...

KillaKitiie

**** when i ported mine the uim and lim i noticed a nice difference exspecialy around 4k and up,kinda suckes ya into your seat.

neu

i'm trying to find a good balance between power, and streetability... im not sure if this is even going to be possible with the N/A... i have to leave my emissions junk in to be able to drive it.. so im not sure what i can do and keep it legal.

BlaCkPlaGUE

Yea use a fuel controller.
It would be worth it imo. The afm is the first restricting component of the FI system for the seven, its the main bottleneck and everything else that can be ported will actually be worth it if you could change the afm.